Suggestions for small fruit trees

I would like to plant two small fruit trees at the top of my plot. I really need them to stay under 6ft tall so they don't overshadow other things (I share the plot with a neighbour). Preferably pears or plums - any ideas?

Thanks!

I don't know about pears...but the smallest rootstock for plums is Pixy and this results in a tree that's about 10ft at maturity.

Pear trees can be a bit of a handful as well, even on a dwarfing rootstock and you're likely to end up with at least 9-10 feet high at maturity. If you put them in a large container to restrict root growth you might be OK but you would have to do additional feeding and watering and be severe with your pruning.

May be smaller than you are after but how about something like a patio tree?:

http://www.kenmuir.co.uk/index.php/trees/pears/terrace-pear-terrace-pearl.html
http://www.shop.express.co.uk/i-ee-midgetfruit10/?LinkRef=F.R
http://www.thompson-morgan.com/fruit/fruit-trees/apple-and-pear-trees/patio-fruit-trees/pwt04546TM
http://www.spaldingbulb.co.uk/r_12945-042/Apples/Dwarf-Apple-Fruit.htm
http://www.spaldingbulb.co.uk/r_12906-042/Dwarf-fruit-trees/Dwarf-Pear-Fruit.htm
http://www.spaldingbulb.co.uk/r_12937-042/Balcony-products/Dwarf-Cherry-Compact-Stella-Fruit.htm

I have a terrace pearl pear in my front garden and it has been fantastic this year - loads of fruit